Exhaust-box or silencer for explosion-engines.



No. 746,527. PATENTED DEC. 1903.

A. KREBS. v EXHAUST BOX 0R SILENOER FOR EXPLOSION ENGINES.

APPLICATION FILED MAY 8, 1903.

7 NO MODEL.

L won WASHINGTON n r UNITED STATES Fatented December 8, 1908.

PATENT OFFICE.

ARTHUR KREBS, or PARIS, FRANCE, ASSIGNOR TO sooinrn ANONYME DES ANOIENS ETABLISSEMENTS PANHARD ET LEVASSOR, OF PARIS, FRANCE.

EXHAUST-BOX OR SILENCER FOR EXPLOSION-ENGINES.

SPECIFICATION forming part of Letters Patent No. 746,527, dated December 8, 1903.

Application filed May 8,1903. Serial No. 156,812. (No model.)

To all whom it may concern.- Be it known that I, ARTHUR KREBS, engineer, a citizen of the French Republic, residing at Paris, department of the Seine, France, (whose post-oflice address is 19 Avenue dIvry, in the said city,) have invented certain new and useful Improvements in Exhaust-Boxes or Silencers for Explosion-Engines, of which the following is a specification. to My invention relates to mufflers for explosive-engines for use in dulling the sound produced by the sudden expansion of the'gases.

Mufflers or silencers as heretofore constructed have usually consisted of a metallic I5 cylinder closed at each end, into which the pipes leading from the exhaust-ports of the engine discharge the exhaust-gases. Upon the discharge of the gases into such muffler they expand to an extent limited by the walls 20 of the muffler and the pressure received there causes the gases to discharge themselves through suitable outlets to the atmosphere at a reduced speed and with less noise than if the discharge had taken place directly from the exhaust-pipe to the atmosphere. A double expansion may be obtained by dividing the muffler in two parts by means of a wall. The mufflers or silencers of the class just described are not, however, absolutely efficient, 0 because their walls vibrate under the influence of the successive discharges and expansions of the gas and transmit part of the sound. According to my invention and in order to prevent this transmission of sound I place against the walls of the muffler on either or both the inside and outside thereof a sheet or sheets of plastic incombustible material capable of preventing or resisting any vibration caused by the shocks or friction due to the discharge or expansion of the gas. I

prefer to make these sheets of plastic material of amianthus or asbestos cloth of a convenient thickness and to arrange one or more layers thereof against the walls of the muffler and secure them thereto by means of a wire-gauze or perforated metal plates, bands, or any other convenient means.

In order that my invention may be clearly understood, I shall describe it with reference to the annexed drawings, of which- Figure 1 is a section of a muffler or silencer according to my invention. Fig. 2 is an end elevation of the muffler or silencer with the head removed. Figs. 3 and 4.- are details showing the asbestos cloth fixed on the walls of the silencer.

The muffler or silencer consists of a casing divided into two chambers a and b bya partition c. The chambers communicate through an opening in the partition 0, and through this opening extends a pipe at, which projects into the chamber 1). The pipe 01 has its end corresponding to the chamber a open, and has its other end, which projects into the chamber 1), closed. The pipe 61 is further- 65 more provided along its length with perforations through which the gases from the chamber a penetrate into the chamber 1).

c is the inlet-pipe and fthe outlet pipe for the exhaust-gases.

The sheet of asbestos g is arranged against the metallic walls of both the chamber a and the chamber 1) and is secured thereto by means of a wire-gauze h, fixed to the metallic walls by rivets t and washers j. The wiregauze 7t maintains the sheet of asbestos in position andprevents it from being frittered away by the vibrations.

The operation of myinvention is as follows: The gases entering the chamber a through the inlet 6 are allowed to expand and the repeated shocks of the gases against the walls of the chamber are deadened by means of the sheets of asbestos. The gases then escape through the pipe d and the perforations therein into the chamber Z). By reasog of the perforations in the pipe d the speed of the gases coming from the chamber is greatly reduced and the gases divided in all directions in the chamber 1). Here they are again allowed to go expand, and their shocks against the walls of the chamber are deadened by the sheet of asbestos. From the chamber 1) the gases are allowed to escape through the outlet f.

Having thus described my invention and in what manner the same may be performed, what I claim is- In a muffler the combination of a casing provided with a transverse partition forming a primary and a secondary expanding-chamber, a perforated pipe connected with said partition, arranged in one of said chambers and communicating with the other of said ing, and washers mounted upon said rivets chambers, a Wire-gauze of the same contour and bearing against said Wire-gauze.

as said casing and arranged Within the same, In testimony whereof I have hereunto set a sheet of asbestos of the same contour as my hand in presence of two subscribing Witsaid casing interposed between said wirenesses.

gauze and the inner face of said casing, a

plurality of rivets projecting in said casing through said asbestos and Wire-gauze and pro- Witnesses:

vided With Washers engaging the gauze for AUGUSTUS E. INGRAM, 1o fixedly securing the asbestos Within the cas- EMILE KLOTZ.

ARTHUR KREBS. 

